[Cisco MDS Cheat Sheet
Roseanne Devon
This article provides a Cisco commands cheat sheet, outlining the most common Cisco IOS commands for configuring, securing and troubleshooting Cisco network equipment. It includes the list of Cisco switch commands, a Cisco router commands list and Cisco network commands. Being familiar with the basic Cisco console commands will aid network administrators in managing Cisco devices efficiently and in line with best practices.
Cisco IOS has several command modes that fall into further categories such as operational and configuration. Each mode serves a slightly unique purpose. For instance, Setup Mode provides the user with an interactive menu guide the user to create an initial configuration file for the device.
The Cisco Command Line Interface (CLI) is a text-based interface used for configuring and managing Cisco network devices, including switches. The CLI provides a command-driven environment where network administrators can enter commands to perform various configuration, monitoring, and troubleshooting tasks on Cisco switches.
Now that you have launched the CLI, type in the enable command to enter privileged EXEC mode. Set a Hostname, EXEC mode password, Console password, TELNET (VTY) password, and interface descriptions for the switch as shown in the table below.
To prevent unauthorized access to your LAN, it is usually advisable to identify and limit the MAC addresses of the workstations that are allowed to access the switch port. Port security is the tool that helps us achieve this.
If you limit the number of secure MAC addresses to one and assign a single secure MAC address, the workstation attached to that port is assured the full bandwidth of the port. If a port is configured as a secure port and the maximum number of secure MAC addresses is reached. When the MAC address of a workstation attempting to access the port is different from any of the identified secure MAC addresses, a security violation occurs.
We have two options for associating MAC addresses with interfaces: static and dynamic. In the static method, we have to manually define the exact MAC address of the host. In the dynamic method, we use the sticky feature (see table below) that allows interfaces to learn MAC addresses automatically until it reaches the maximum number of allowed hosts.
Virtual Local Area Network (VLAN), as the name implies, is a virtual segmentation of a switched network to provide for security, flexibility, and effective network administration. So by assigning switch ports or users to VLAN groups on a switch or group of connected switches. You gain the flexibility to add only the users or departments you want into that broadcast domain, without worrying about the physical location of the hosts.
You can create VLANs from 2 to 4094 depending on the model of your switch. VLAN 1 is the default VLAN. You can manually or dynamically (via the Dynamic Trunking Protocol) configure a port as an access or trunk port. A switch port can belong to only one VLAN if it is an access port (carries the traffic of only one VLAN) or all VLANs if it is a trunk port (carries the traffic of multiple VLANs). To configure VLANs on a Cisco Catalyst switch, use the global config vlan command as shown below:
You configure a port to belong to a VLAN by assigning a membership mode that specifies the kind of traffic the port carries, plus the number of VLANs to which it can belong. You can configure each port on a switch to be in a specific VLAN (access port) by using the interface switchport command as shown below.
The above cheat sheet provides a basic summary of the Cisco CLI switch commands. Remember to replace the specific parameters used and/or placeholders such as [interface-name], [mode], [number], [acl-number], [source], [destination], and [protocol] with the appropriate values for your configuration. Please note that the specific command syntax and available options may vary depending on the switch model and firmware version. Refer to the Cisco documentation and command references for detailed information on specific commands and their usage.
Almost all Cisco devices use Cisco IOS to operate and Cisco CLI to be managed. The basic CLI commands for all of them are the same, which simplifies Cisco device management. Here is a Cisco commands cheat sheet that describes the basic commands for configuring, securing and troubleshooting Cisco network devices.
Configures the VLAN membership mode of a port. The access port is set to access unconditionally and operates as a non-trunking, single VLAN interface that sends and receives non-encapsulated (non-tagged) frames. An access port can be assigned to only one VLAN.
The trunk port sends and receives encapsulated (tagged) frames that identify the VLAN of origination. A trunk is a point-to-point link between two switches or between a switch and a router.
Used in vty line configuration mode, defines whether Telnet or SSH access is allowed into this switch. Both values can be specified in a single command to allow both Telnet and SSH access (default settings).
I recently found myself in the midst of having to setup some VLANs from scratch in an environment that was a hodgepodge of switches. The terms alone between vendors can drive you mad (e.g. access mode vs untagged, dot1q trunk vs. tagged, etc.)
Long story short, we got the switches down to either Cisco Catalysts or Cisco Small Business switches. After hopping between switch models enough times, the commands would just get muddled up in my head. Finally, after the umpteenth typo, I made some cheat sheets for myself as I found I was issuing the same commands over and over, but depending on the switch product line, it was slightly different.
Lastly I had to get these hooked up into a few ESXi hosts. This part took longer than it should have as I could not get the VLANs on the vSphere side to talk properly to the VLANs on the switches (as well as physical hosts that I had plugged into them).
I have tended to stick to port groups in the past as I feel that visually they are easier to quickly identify what is running on what VLAN. If I have a machine like a DNS server that needs access to multiple VLANs, then I will typically add another vmnic to the guest and pop it onto the required port group.
For vendor diversity, Many enterprises use Identity Management solutions from two vendors, Cisco ISE and Aruba ClearPass.
This cheat sheet is for Cisco ISE engineers looking to understand ClearPass.
Stocks: 15 20 minute delay (Cboe BZX is real-time), ET. Volume reflects consolidated markets. Futures and Forex: 10 or 15 minute delay, CT. Market Data powered by Barchart Solutions. Fundamental data provided by Zacks and Morningstar.
The Cheat Sheet is based on end-of-day prices and intended for the current trading session if the market is open, or the next trading session if the market is closed. Please note that the Cheat Sheet page can reflect ahead of the pivot points that display on the chart. The Cheat Sheet updates when it receives a settlement price at the end of the trading session. The chart has no way to know if a market is settled, so it only updates upon receiving a price for the next session.
The projected trigger prices of the signals are listed from highest price at the top of the page to lowest price at the bottom. These are shaded in blue if the common interpretation of the signal is bullish, and shaded in red if the common interpretation of the signal is bearish.
Each projection on the ladder can be examined to determine if the price change to each trigger level will tend to confirm or reverse the price move. This legend can be found at the bottom of the Cheat Sheet page:
The complete Cheat Sheet can be used to give an indication of market timing. Blue below the current price and red above will tend to keep trading in a narrow band, whereas blue above the current price, or red below can produce a breakout where each new price level is confirmed by a new signal.
Some of these signals, such as Fibonacci Retracements, have a fixed bullish or bearish interpretation. Others, such as crossovers of a short-term and a long-term moving average, are interpreted as a reversal of the current signal.
Some of these projections will produce trigger prices so far removed from the price action that they can be ignored. The closer the trigger price to the current price, the more quickly it will come into play. A price projection of 0.00 is valid for a technical indicator if the calculation determines it will be impossible to trigger the signal.
We show four separate pivot points (2 Support Levels, and 2 Resistance Points). The Last Price shown is the last trade price at the time the quote page was displayed, and will not update every 10 seconds (as the Last Price at the top of the Quote page does). The Last Price will update only when the page is refreshed.
Pivot points are used to identify intraday support, resistance and target levels. The pivot point and its support and resistance pairs are defined as follows, where H, L, C are the current day's high, low and close, respectively. Support and Resistance points are based on end-of-day prices and are intended for the current trading session if the market is open, or the next trading session if the market is closed.
The moving average periods shown on the cheat sheet (9, 18, 40) were popular with floor traders back in the day. These moving averages are the calculated price which the underlying symbol needs to reach for the price to be considered "above the moving average." These figures are not available on a chart.
Standard Deviation, which is a measure of past volatility, provides a mathematical possibility of trading range based on the mean values over the course of 1-year. These are useful in providing statistically important support and resistance levels.
Price 1 Standard Deviation provides a possible trading range around 68% of the time. So it is anticipated that roughly 2 out of 3 times the market will stay within Price 1 Standard Deviation support and resistance range for the next trading session, and only 1 out of 3 days will the market move outside of the support or resistance levels.
795a8134c1